ProPhase Labs, Inc. engages in the research, development, manufacture, distribution, marketing, and sale of over-the-counter (OTC) consumer healthcare products and dietary supplements in the United States. It offers a range of OTC dietary supplements, including Legendz XL for sexual health; Triple Edge XL, an energy booster and testosterone support product; and Super ProstaFlow+ a supplement to support prostate and urinary health under the TK Supplements brand. The company also provides contract manufacturing services, such as product development, pre-commercialization, production, warehousing, and distribution; and offers COVID-19 and other respiratory pathogen panel testing services. It serves consumer products companies, as well as large national chain, regional, specialty, and local retail stores. The company was formerly known as The Quigley Corporation. ProPhase Labs, Inc. was founded in 1989 and is headquartered in Doylestown, Pennsylvania.